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- W2155343007 abstract "Abstract Idescribe an assay for total cholesterol in serum, with use of the AutoAnalyzer ii (Technicon), in which cholesterol esters are saponified by alkali, cholesterol is held in aqueous micellar solution with a surfactant (Triton X-100) and oxidized by cholesterol oxidase, and the hydrogen peroxide produced is measured by chelation with Ti4+ and xylenol orange. An assay for free cholesterol in serum, based on similar principles, is also described, and the two can be run simultaneously on a dual-channel AutoAnalyzer II. Standard solutions of cholesterol in isopropanol have poorer carryover characteristics than sera, and therefore do not reach the same continuous-flow steady state as sera of equivalent concentrations. Consequent potential calibration errors are avoided by using micellar solutions of cholesterol containing albumin for standardization. The formation of cholesterol peroxide in solutions of cholesterol in isopropanol is demonstrated, and this constitutes another potential source of error in the calibration of enzymic cholesterol assays. In analyzing patients' sera, results of the total cholesterol assay correlate well with those of a mechanized method in which cholesterol esterase and cholesterol oxidase are used; an automated Abell method, calibrated with solutions of cholesterol in isopropanol, gave slightly higher values. Determinations of the ratio of free cholesterol to total cholesterol by our automated cholesterol exidase assays given values that agree well with published results in which digitonin precipitation is used." @default.
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- W2155343007 date "1976-10-01" @default.
- W2155343007 modified "2023-10-14" @default.
- W2155343007 title "Use of cholesterol oxidase for assay of total and free cholesterol in serum by continuous-flow analysis." @default.
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- W2155343007 doi "https://doi.org/10.1093/clinchem/22.10.1579" @default.
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